import React, { Component } from "react";
import {jsx} from "react/jsx-runtime"
class App extends Component {
  // React 17.0 之前 组件创建的本质 
  // React 17.0 之后变成 import { jsx } from "react/jsx-runtime";
  render() {
    // return <h1>123</h1>;
    // return React.createElement("h1",{},"123");
    return jsx("h1",{
      children:"123456"
    })
  }
}

export default App;
